| Sharethingseasy AS | Information & communication | 2024 |
| Sheda Transport AS | Transport & logistics | 2025 |
| Si-Sa Holding AS | Other services | 2021 |
| Sidequest Invest AS | | 2021 |
| Sigmatic Holding AS | | 2023 |
| Signnativ AS | Information & communication | 2025 |
| Simama Express AS | Transport & logistics | 2025 |
| Simama Holding AS | | 2025 |
| Simreg Holding AS | | 2021 |
| Sindre Stenhaug AS | Construction | 2021 |
| Sipano Norge AS | Wholesale & retail | 1971 |
| Siv.Ing Per Ø Hansen AS | Professional & scientific | 2002 |
| Sivilingeniør Haakon Wiig AS | Information & communication | 1987 |
| SK Byggservice AS | Construction | 2020 |
| Skabright AS | Manufacturing | 2016 |
| Skandora Eiendom AS | Real estate | 2022 |
| Skandora Holding AS | Professional & scientific | 2020 |
| Skaugs Eiendom 1 AS | Real estate | 2026 |
| Skaugs Eiendom AS | Real estate | 2025 |
| Skaugs Lakk Og Skadesenter AS | Other services | 2013 |
| Skaugs Servicesenter AS | Wholesale & retail | 1990 |
| Skjønnhetshuset AS | Other services | 2018 |
| Skogbrukets Konferansesenter AS | Real estate | 2007 |
| Skogbrukets Servicesenter AS | Professional & scientific | 2011 |
| Skogsverktøy AS | Wholesale & retail | 1996 |
| Skogvegen 16 AS | Real estate | 2023 |
| Skolevegen 4 Eiendom AS | Real estate | 2019 |
| Skumsrudvegen 33 AS | Real estate | 2021 |
| Skyberg Invest AS | Construction | 2016 |
| Skyttermoen AS | | 2026 |
| Slåttsvevegen 61 AS | Real estate | 2023 |
| Slæpen Gård AS | Wholesale & retail | 2025 |
| Smart Eiendom AS | Real estate | 2016 |
| Smart Profil AS | Professional & scientific | 2006 |
| Smuler AS | | 2021 |
| Snekke Mat AS | Wholesale & retail | 2023 |
| Snekkevik Invest AS | Real estate | 2014 |
| Snuggerud Transport AS | Transport & logistics | 2012 |
| Snøplogbakken 2 AS | Real estate | 2015 |
| Soar Eiendom AS | Real estate | 2022 |
| Sol Eiendom AS | Real estate | 2001 |
| Sol Utleie AS | Administrative & support | 2023 |
| Sola Skinner Holding AS | | 2023 |
| Solberg Elektroinstallasjon AS | Construction | 1989 |
| Solør Bioenergi Varme AS | Manufacturing | 2000 |
| Sone Berg Eiendom AS | Real estate | 2003 |
| Sonic Debris Da | Arts & recreation | 2014 |
| Soput Acceleration AS | | 2020 |
| Sparingen AS | Construction | 2015 |
| Sparingen Eiendom AS | Construction | 2001 |
| SSD Invest AS | | 2026 |
| Stasjonsdrift Nordstad AS | Wholesale & retail | 2023 |
| Steena Invest AS | Financial services | 2016 |
| Steep Hills AS | | 2021 |
| Stein K AS | Wholesale & retail | 2017 |
| Steinar Løvbak AS | Construction | 1999 |
| Stenberg Eiendom 2 AS | Real estate | 2026 |
| Stenberg Eiendom AS | Real estate | 2000 |
| Stensli Eiendom AS | Real estate | 2006 |
| Stensli Gjenvinning AS | Water & waste | 1996 |
| Stensli Transport AS | Transport & logistics | 1997 |
| Stenvåg Bygg Og Eiendom AS | Construction | 2012 |
| Stenvåg Invest AS | Manufacturing | 2019 |
| Stian Bakken AS | | 2011 |
| Stian Skar Holding AS | | 2021 |
| Stiwa Holding AS | Professional & scientific | 2015 |
| Stolvstadvegen 5 AS | Real estate | 2024 |
| Stopdigging Innlandet AS | Construction | 2020 |
| Storgata 46 Lillehammer AS | Real estate | 2021 |
| Storsandlia Brygge AS | Real estate | 2016 |
| Storstillia Jaktlag Bjørn Sønsteby SA | Agriculture & fishing | 2005 |
| Strafferunden Invest AS | | 2026 |
| Strandgata 30 Gjøvik AS | Real estate | 2005 |
| Strandgata Hamar AS | Real estate | 2021 |
| Strandgaten 53 AS | Real estate | 1960 |
| Strandgaten 55 AS | Real estate | 2008 |
| Strandsagvegen 11 AS | Real estate | 2007 |
| Strandsagvegen 27 AS | Real estate | 2024 |
| Strandvegen 14 AS | Real estate | 1999 |
| Strandvegen 34 AS | Real estate | 2019 |
| Strøm Entreprenør AS | Construction | 1989 |
| Strømsøyen Holding AS | | 2025 |
| Stubbom Hudklinikk AS | Other services | 2023 |
| Stylizimo Da | Information & communication | 2010 |
| Sun and Smile Journeys AS | Administrative & support | 2026 |
| Sushi House Og Asiatisk Mat AS | Hospitality | 2025 |
| Svanheim Ans | Real estate | 2024 |
| Svemark AS | Real estate | 2018 |
| Sven Erik Johansen Transport AS | Transport & logistics | 2013 |
| Svenhaug AS | Agriculture & fishing | 2006 |
| Sverre F. Worren AS | Real estate | 2005 |
| Sylinderakutten AS | Manufacturing | 2002 |
| Syversen Eiendom AS | Administrative & support | 1998 |
| Sørensen Transport AS | Transport & logistics | 2020 |
| Sørli Fritidsgård Da | Agriculture & fishing | 2019 |
| Sørli Gård Da | Arts & recreation | 2026 |
| Sørlie Og Bakkerud AS | Manufacturing | 2024 |
| Søsknene Michaelsen Da | Agriculture & fishing | 2009 |
| T. Nordal Holding AS | Construction | 2024 |
| T/E Service Da | Wholesale & retail | 2011 |